Home of all dually trucks with the GMC/Chevy 3500HD series truck a point of interest.

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You can appreciate the “beef” of the GMC/Chevy 3500HD trucks, a stripped rolling 3500HD chassis weighs more than a running C1500!

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I have been reading we (3500hd's) have a higher pressure regulator factory. I have read it is 30 psi as opposed to the 13-15 psi of a half ton truck. I have also read we have small stock injectors 42#. I have been thinking about replacing my stock injectors with 55-60# units. and adding a chip (maybe a custom one) along with free flowing exhaust (no cats).Would you see a power gain in this setup of am I missing something?

I had a 95 tbi 1/2 ton w/ 305 back in 96, I changed out to larger Holley injectors, and raised the stock pressure to 20 psi, along with a chip and underdrive pulleys and exhaust, it was noticeable. and smoked stock 350's of the day. I was hoping to repeat those results with my 3500hd.

Don't remember which engine you have but fuel alone won't make a huge difference. As you know, heads, cam and exhaust need to be included in a performance upgrade. I have had luck un-soldering the proms in 1227747 ECM and soldering in a zif socket so we could use a flashable prom.

What I did with my current 3500HD is install a TPI setup and wired in a TPI ecm to run it. Did not put it on the road yet, it's done but I don't want to drive it in the Winter. The truck is parked outside and has been sitting for a couple of months....this AM it fired right up. I'll know in Spring how it works, the TPI engines are noted for low end torque.

You are right Someotherguy, I did read that only 94-95 3500HD's had the high pressure pump. Thanks for stating that.

I have a 1994 3500hd. I have not checked the pressure, but from what I have read it should be 30psi with 42# injectors.That said, would there be any gains if I switched to a 50-60# injectors and removed the cat and opened up the exhaust?